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S/N ratio (SNR: Signal to Noise Ratio)

Latest Updated:03/01/2007

Question:

S/N ratio (SNR: Signal to Noise Ratio)

Answer:

The S/N ratio, one of the measures of signal transmission quality, expresses the signal/noise ratio in decibels . The larger this value, the higher the transmission quality. The S/N ratio is used as one of the reproduction characteristics of recording media such as magnetic tapes, magnetic discs, and optical discs. For example, a cassette tape has an S/N ratio of approximately 50 dB (signal voltage is 300 times the noise voltage), and a CD has an S/N ratio of approximately 100 dB (signal voltage is 100,000 times as large as the noise voltage).
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